Effects of altitude on paper airplanes If one were to fly a paper airplane at the Dead Sea (400 meters below sea level) and another identical paper airplane at the peak of Mount Everest (8800 meters above sea level) would there be any noticeable effects on the flight of the airplane? Assume still air with no thermals and flight far from surfaces such as the ground of rock formations.

The effects I'm interested in are the differences in air pressure and temperature on the flight of a conventional paper airplane. Would humidity affect this as well? I've heard of how Reynolds number affects paper airplanes differently than jet airliners, and this number seems to depend on properties of the air as well as properties of the airplane.
Note that this question was translated into English by my father, who is the one typing it. I'm thirteen years old and I don't use SE unsupervised.
 A: To answer this question, consider Bernouli's equation:
$P= \frac{1}{2}\rho v^2$
which is the pressure the wind will exert on the wings to generate lift.
So how would the paper plane perform? The faster you throw the plane (the faster the wind speed below and above the plane, and assuming the existing wind speeds are negligible) will determine how fast and how long the plane will fly. If we rearrange this equation,
$v = \sqrt \frac{2P}{\rho}$
we can see that (how fast you throw the plane $v$ increasing the performance is obvious) the value of the pressure $P$ and density $\rho$ will be the determining factors. So what this means is if you were to throw the plane with the same strength at the Dead Sea (high pressure) as you would at the peak of Mount Everest (low pressure), we can see that the plane will perform much better at the Dead See. Of course a change in humidity would have an affect, but a change in humidity accompanies a change in pressure, so once again we are back to pressure being the important factor.
